<template>
    <el-dialog
      width="500px"
      title="员工导入"
      :visible="showExcelDialog"
      @close="$emit('update:showExcelDialog', false)"
    >
      <el-row type="flex" justify="center">
        <div class="upload-excel">
          <input
            ref="excel-upload-input"
            class="excel-upload-input"
            type="file"
            accept=".xlsx, .xls"
            @change = "uploadChange"
          >
          <div class="drop">
            <i class="el-icon-upload" />
            <el-button type="text" @click="getExportTemplate">下载导入模板</el-button>
            <span>将文件拖到此处或
              <el-button type="text" @click="handleUpload">点击上传</el-button>
            </span>
          </div>
        </div>
      </el-row>
      <el-row type="flex" justify="end">
        <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
        <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
      </el-row>
    </el-dialog>
  </template>
  <script>
  import {getExportTemplate,exportUpload} from '@/api/employee'
  import FileSaver from 'file-saver'
  export default {
    props: {
      showExcelDialog: {
        type: Boolean,
        default: false
      }
    },
    methods: {
      //下载模板
     async getExportTemplate(){
       const result = await getExportTemplate()
        FileSaver.saveAs(result,"员工信息模板.xlsx")
      },
      //使用refs获取input实例对象,触发点解事件
      handleUpload(){
        this.$refs['excel-upload-input'].click()
      },
      //监听input值是否发生改变,h5原生内容,改变的数据将保存在event中
      async uploadChange(event){
        const files = event.target.files //
        //判断文件是否加入
        if(files.length > 0){
          try{
            const data =  new FormData()
            data.append('file', files[0])
            await exportUpload(data)
            this.$emit('uploadSuccess') //通知父组件上传成功，刷新员工列表
            this.$emit('update:showExcelDialog', false) //成功关闭弹框
            this.$message.success('上传成功！！！')
          }catch{
            this.$message.error('上传失败！！！')
          }finally{
            this.$refs['excel-upload-input'].value = '' 
          }
        }else{
          this.$message.warning('导入的文件为空')
        }
      }
    }
  }
  </script>
  
  <style scoped lang="scss">
      .upload-excel {
        display: flex;
        justify-content: center;
        margin: 20px;
        width: 360px;
        height: 180px;
        align-items: center;
        color: #697086;
        .excel-upload-input {
          display: none;
          z-index: -9999;
        }
        .btn-upload,
        .drop {
          border: 1px dashed #dcdfe6;
          width: 100%;
          height: 100%;
          text-align: center;
          line-height: 160px;
          border-radius: 8px;
          display: flex;
          flex-direction: column;
          justify-content: center;
        }
        .drop {
          line-height: 40px;
          color: #bbb;
          i {
            font-size: 60px;
            display: block;
            color: #c0c4cc;
          }
        }
      }
  </style>